xref: /freebsd/sys/contrib/device-tree/Bindings/mux/adi,adg792a.txt (revision b077aed33b7b6aefca7b17ddb250cf521f938613) 
1Bindings for Analog Devices ADG792A/G Triple 4:1 Multiplexers
2
3Required properties:
4- compatible : "adi,adg792a" or "adi,adg792g"
5- #mux-control-cells : <0> if parallel (the three muxes are bound together
6  with a single mux controller controlling all three muxes), or <1> if
7  not (one mux controller for each mux).
8* Standard mux-controller bindings as described in mux-controller.yaml
9
10Optional properties for ADG792G:
11- gpio-controller : if present, #gpio-cells below is required.
12- #gpio-cells : should be <2>
13			  - First cell is the GPO line number, i.e. 0 or 1
14			  - Second cell is used to specify active high (0)
15			    or active low (1)
16
17Optional properties:
18- idle-state : if present, array of states that the mux controllers will have
19  when idle. The special state MUX_IDLE_AS_IS is the default and
20  MUX_IDLE_DISCONNECT is also supported.
21
22States 0 through 3 correspond to signals A through D in the datasheet.
23
24Example:
25
26	/*
27	 * Three independent mux controllers (of which one is used).
28	 * Mux 0 is disconnected when idle, mux 1 idles in the previously
29	 * selected state and mux 2 idles with signal B.
30	 */
31	&i2c0 {
32		mux: mux-controller@50 {
33			compatible = "adi,adg792a";
34			reg = <0x50>;
35			#mux-control-cells = <1>;
36
37			idle-state = <MUX_IDLE_DISCONNECT MUX_IDLE_AS_IS 1>;
38		};
39	};
40
41	adc-mux {
42		compatible = "io-channel-mux";
43		io-channels = <&adc 0>;
44		io-channel-names = "parent";
45
46		mux-controls = <&mux 2>;
47
48		channels = "sync-1", "", "out";
49	};
50
51
52	/*
53	 * Three parallel muxes with one mux controller, useful e.g. if
54	 * the adc is differential, thus needing two signals to be muxed
55	 * simultaneously for correct operation.
56	 */
57	&i2c0 {
58		pmux: mux-controller@50 {
59			compatible = "adi,adg792a";
60			reg = <0x50>;
61			#mux-control-cells = <0>;
62
63			idle-state = <1>;
64		};
65	};
66
67	diff-adc-mux {
68		compatible = "io-channel-mux";
69		io-channels = <&adc 0>;
70		io-channel-names = "parent";
71
72		mux-controls = <&pmux>;
73
74		channels = "sync-1", "", "out";
75	};
76